Emulation of 8088 CPU with Video System

Emulation of 8088 CPU with Video System

I thinking about writing simple 8088 emulator. But I can't understand how
to connect 8088 core with video subsystem.
I thinking about main loop:
while (TRUE)
{
execute_cpu_cycles_per_scanline() ;
paint_scanline() ;
}
Does this method is suitable for CPU and graphics emulation? Any other
methods ? Any good explanation why I can't use different threads for CPU
and Video. How dealing with this problem emulators like QEMU or others
(x86).
Thanks.